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krespomx
Joined: 20 May 2001
Posts: 40
Location: MXO
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 04 May 2002 8:53 |
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hi, i looking for a smoke sensor, not smoke detectors,
if some one have information about it.
thx!!!
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meax98
Joined: 25 Nov 2001
Posts: 441
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| 04 May 2002 12:01 |
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| What is the difference: smoke sensor or smoke detectors?
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gulson
Joined: 01 Jan 1970
Posts: 551
Helped: 1
Location: Poland
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| 04 May 2002 15:17 |
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| maybe smoke sensors can specify how much smoke is in the room, smoke detectors can only detect the smoke?
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tosh1103
Joined: 20 Jan 2002
Posts: 12
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| 04 May 2002 16:22 |
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There's two main types i think? The ionic type which works using a
isotope in the detector, and the optical type which works by the smoke
obscuring the photo detector. I suppose the later one could be used to
detect the concentration of smoke.
Tosh
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meax98
Joined: 25 Nov 2001
Posts: 441
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| 04 May 2002 18:02 |
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Smoke detectors are designed to detect smoke within a protected structure. In a properly designed fire alarm system, they are strategically placed in all occupied areas. System smoke detectors are designed to be connected to a fire alarm system, or as an option to an intrusion alarm system. Fire systems manufactures two types of smoke detectors: Long Range Beam and Photoelectric smoke detectors.
Long Range Beam Smoke Detectors are designed to protect a very large area. They can protect an area up to 350 feet by 60 feet. Long Range Beam smoke detectors use a separate Transmitter and Receiver. The transmitter projects an infrared beam which is measured at the receiver. If the beam is obscured by smoke, the receiver signals an alarm. If the beam is obscured by dust or dirt, or is blocked by a foreign object, the Receiver signals a trouble condition.
Photoelectric Smoke Detectors use an internal sensing chamber that includes a light source and a light sensitive receiver. The chamber is designed so that no ambient light can enter, but smoke can flow through it easily. Normally the receiver sees very little light from the light source. Smoke causes the light inside the chamber to scatter. This scattering action causes more light to be seen by the receiver. The detector measures this increase in signal and signals an alarm.
Photoelectric smoke detectors feature a patented chamber design which is virtually immune to dust. Chamber Check automatic trouble indication monitors the chamber to dust buildup. If the chamber becomes too sensitive, the detector will signal a trouble condition, before a false alarm can occur.
That's about smoke sensors or smoke detectors.
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turttle
Joined: 31 May 2001
Posts: 45
Helped: 5
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| 04 May 2002 21:51 |
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More about the same: ionic detectors can detect smaller particles than optoelectronic ones but they must be used under severe radioactivity normatives because of the ionizer isotope they have, so they are seldom used nowadays.
Cheers 
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my_books
Joined: 29 Jun 2006
Posts: 224
Helped: 2
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| 27 Jun 2008 19:16 smoke sensors!!!! |
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What kind of smoke do u want to sense ?
i.e smoke from wood or automobile e.t.c.
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